Assets and Liabilities Measured at Fair Value on a Recurring Basis - Schedule of unobservable inputs related to Level 3 fair value measurements (Details) - Level 3: Significant Unobservable Inputs - number	Sep. 30, 2021	Sep. 30, 2020
Discount Rate | Real Estate Properties and Joint Ventures | Office | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.058	0.058
Discount Rate | Real Estate Properties and Joint Ventures | Office | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.095	0.090
Discount Rate | Real Estate Properties and Joint Ventures | Office | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.067	0.067
Discount Rate | Real Estate Properties and Joint Ventures | Industrial | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.050	0.052
Discount Rate | Real Estate Properties and Joint Ventures | Industrial | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.085	0.090
Discount Rate | Real Estate Properties and Joint Ventures | Industrial | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.062	0.066
Discount Rate | Real Estate Properties and Joint Ventures | Apartment | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.055	0.053
Discount Rate | Real Estate Properties and Joint Ventures | Apartment | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.075	0.078
Discount Rate | Real Estate Properties and Joint Ventures | Apartment | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.061	0.064
Discount Rate | Real Estate Properties and Joint Ventures | Retail | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.060	0.053
Discount Rate | Real Estate Properties and Joint Ventures | Retail | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.118	0.118
Discount Rate | Real Estate Properties and Joint Ventures | Retail | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.070	0.068
Discount Rate | Real Estate Properties and Joint Ventures | Hotel | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.103	0.103
Discount Rate | Real Estate Properties and Joint Ventures | Hotel | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.103	0.103
Discount Rate | Real Estate Operating Business | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.077
Capitalization Rate | Real Estate Properties and Joint Ventures | Office | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.045	0.040
Capitalization Rate | Real Estate Properties and Joint Ventures | Office | Minimum | Direct Capitalization
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.040	0.040
Capitalization Rate | Real Estate Properties and Joint Ventures | Office | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.085	0.083
Capitalization Rate | Real Estate Properties and Joint Ventures | Office | Maximum | Direct Capitalization
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.080	0.080
Capitalization Rate | Real Estate Properties and Joint Ventures | Office | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.056	0.055
Capitalization Rate | Real Estate Properties and Joint Ventures | Office | Weighted Average | Direct Capitalization
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.051	0.050
Capitalization Rate | Real Estate Properties and Joint Ventures | Industrial | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.043	0.043
Capitalization Rate | Real Estate Properties and Joint Ventures | Industrial | Minimum | Direct Capitalization
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.028	0.038
Capitalization Rate | Real Estate Properties and Joint Ventures | Industrial | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.070	0.073
Capitalization Rate | Real Estate Properties and Joint Ventures | Industrial | Maximum | Direct Capitalization
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.068	0.070
Capitalization Rate | Real Estate Properties and Joint Ventures | Industrial | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.049	0.054
Capitalization Rate | Real Estate Properties and Joint Ventures | Industrial | Weighted Average | Direct Capitalization
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.043	0.048
Capitalization Rate | Real Estate Properties and Joint Ventures | Apartment | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.040	0.043
Capitalization Rate | Real Estate Properties and Joint Ventures | Apartment | Minimum | Direct Capitalization
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.035	0.038
Capitalization Rate | Real Estate Properties and Joint Ventures | Apartment | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.065	0.068
Capitalization Rate | Real Estate Properties and Joint Ventures | Apartment | Maximum | Direct Capitalization
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.058	0.060
Capitalization Rate | Real Estate Properties and Joint Ventures | Apartment | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.047	0.051
Capitalization Rate | Real Estate Properties and Joint Ventures | Apartment | Weighted Average | Direct Capitalization
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.042	0.046
Capitalization Rate | Real Estate Properties and Joint Ventures | Retail | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.050	0.050
Capitalization Rate | Real Estate Properties and Joint Ventures | Retail | Minimum | Direct Capitalization
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.045	0.040
Capitalization Rate | Real Estate Properties and Joint Ventures | Retail | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.090	0.094
Capitalization Rate | Real Estate Properties and Joint Ventures | Retail | Maximum | Direct Capitalization
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.090	0.115
Capitalization Rate | Real Estate Properties and Joint Ventures | Retail | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.057	0.056
Capitalization Rate | Real Estate Properties and Joint Ventures | Retail | Weighted Average | Direct Capitalization
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.053	0.051
Capitalization Rate | Real Estate Properties and Joint Ventures | Hotel | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.078	0.078
Capitalization Rate | Real Estate Properties and Joint Ventures | Hotel | Direct Capitalization
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.075	0.075
Capitalization Rate | Real Estate Properties and Joint Ventures | Hotel | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.078	0.078
Capitalization Rate | Real Estate Properties and Joint Ventures | Hotel | Weighted Average | Direct Capitalization
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.075	0.075
Terminal Growth Rate | Real Estate Operating Business | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.040
EBITDA Multiple | Real Estate Operating Business | Market Approach
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	17.0
Loan to Value Ratio | Loans Payable | Office | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.352	0.345
Loan to Value Ratio | Loans Payable | Office | Minimum | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.352	0.345
Loan to Value Ratio | Loans Payable | Office | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.599	0.554
Loan to Value Ratio | Loans Payable | Office | Maximum | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.599	0.554
Loan to Value Ratio | Loans Payable | Office | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.466	0.451
Loan to Value Ratio | Loans Payable | Office | Weighted Average | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.466	0.451
Loan to Value Ratio | Loans Payable | Industrial | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.414	0.314
Loan to Value Ratio | Loans Payable | Industrial | Minimum | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.414	0.314
Loan to Value Ratio | Loans Payable | Industrial | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.552	0.592
Loan to Value Ratio | Loans Payable | Industrial | Maximum | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.552	0.592
Loan to Value Ratio | Loans Payable | Industrial | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.469	0.529
Loan to Value Ratio | Loans Payable | Industrial | Weighted Average | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.469	0.529
Loan to Value Ratio | Loans Payable | Apartment | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.357	0.298
Loan to Value Ratio | Loans Payable | Apartment | Minimum | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.357	0.298
Loan to Value Ratio | Loans Payable | Apartment | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.615	0.687
Loan to Value Ratio | Loans Payable | Apartment | Maximum | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.615	0.687
Loan to Value Ratio | Loans Payable | Apartment | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.451	0.479
Loan to Value Ratio | Loans Payable | Apartment | Weighted Average | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.451	0.479
Loan to Value Ratio | Loans Payable | Retail | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.377	0.420
Loan to Value Ratio | Loans Payable | Retail | Minimum | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.377	0.420
Loan to Value Ratio | Loans Payable | Retail | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.731	0.651
Loan to Value Ratio | Loans Payable | Retail | Maximum | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.731	0.651
Loan to Value Ratio | Loans Payable | Retail | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.478	0.465
Loan to Value Ratio | Loans Payable | Retail | Weighted Average | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.478	0.465
Loan to Value Ratio | Loans Receivable, including those with related parties | Office | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Receivable, including those with related parties	0.405	0.495
Loan to Value Ratio | Loans Receivable, including those with related parties | Office | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Receivable, including those with related parties	0.918	0.918
Loan to Value Ratio | Loans Receivable, including those with related parties | Office | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Receivable, including those with related parties	0.728	0.746
Loan to Value Ratio | Loans Receivable, including those with related parties | Industrial | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Receivable, including those with related parties	0.294	0.312
Loan to Value Ratio | Loans Receivable, including those with related parties | Industrial | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Receivable, including those with related parties	0.684	0.902
Loan to Value Ratio | Loans Receivable, including those with related parties | Industrial | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Receivable, including those with related parties	0.649	0.618
Loan to Value Ratio | Loans Receivable, including those with related parties | Apartment | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Receivable, including those with related parties	0.384	0.475
Loan to Value Ratio | Loans Receivable, including those with related parties | Apartment | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Receivable, including those with related parties	0.773	0.747
Loan to Value Ratio | Loans Receivable, including those with related parties | Apartment | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Receivable, including those with related parties	0.500	0.635
Loan to Value Ratio | Loans Receivable, including those with related parties | Retail & Hospitality | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Receivable, including those with related parties	0.584	0.528
Loan to Value Ratio | Loans Receivable, including those with related parties | Retail & Hospitality | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Receivable, including those with related parties	0.798	0.930
Loan to Value Ratio | Loans Receivable, including those with related parties | Retail & Hospitality | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Receivable, including those with related parties	0.664	0.847
Equivalency Rate | Loans Payable | Office | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.018	0.024
Equivalency Rate | Loans Payable | Office | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.037	0.034
Equivalency Rate | Loans Payable | Office | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.032	0.030
Equivalency Rate | Loans Payable | Industrial | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.033	0.035
Equivalency Rate | Loans Payable | Industrial | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.037	0.043
Equivalency Rate | Loans Payable | Industrial | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.034	0.036
Equivalency Rate | Loans Payable | Apartment | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.021	0.026
Equivalency Rate | Loans Payable | Apartment | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.030	0.034
Equivalency Rate | Loans Payable | Apartment | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.027	0.030
Equivalency Rate | Loans Payable | Retail | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.025	0.028
Equivalency Rate | Loans Payable | Retail | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.040	0.039
Equivalency Rate | Loans Payable | Retail | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.034	0.031
Equivalency Rate | Loans Receivable, including those with related parties | Office | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Receivable, including those with related parties	0.024	0.035
Equivalency Rate | Loans Receivable, including those with related parties | Office | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Receivable, including those with related parties	0.095	0.095
Equivalency Rate | Loans Receivable, including those with related parties | Office | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Receivable, including those with related parties	0.057	0.064
Equivalency Rate | Loans Receivable, including those with related parties | Industrial | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Receivable, including those with related parties	0.043	0.043
Equivalency Rate | Loans Receivable, including those with related parties | Industrial | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Receivable, including those with related parties	0.051	0.124
Equivalency Rate | Loans Receivable, including those with related parties | Industrial | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Receivable, including those with related parties	0.046	0.081
Equivalency Rate | Loans Receivable, including those with related parties | Apartment | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Receivable, including those with related parties	0.025	0.032
Equivalency Rate | Loans Receivable, including those with related parties | Apartment | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Receivable, including those with related parties	0.086	0.070
Equivalency Rate | Loans Receivable, including those with related parties | Apartment | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Receivable, including those with related parties	0.050	0.049
Equivalency Rate | Loans Receivable, including those with related parties | Retail & Hospitality | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Receivable, including those with related parties	0.036	0.053
Equivalency Rate | Loans Receivable, including those with related parties | Retail & Hospitality | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Receivable, including those with related parties	0.072	0.093
Equivalency Rate | Loans Receivable, including those with related parties | Retail & Hospitality | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Receivable, including those with related parties	0.053	0.060
Weighted Average Cost of Capital Risk Premium Multiple | Loans Payable | Office | Minimum | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	1.2	1.2
Weighted Average Cost of Capital Risk Premium Multiple | Loans Payable | Office | Maximum | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	1.5	1.4
Weighted Average Cost of Capital Risk Premium Multiple | Loans Payable | Office | Weighted Average | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	1.3	1.3
Weighted Average Cost of Capital Risk Premium Multiple | Loans Payable | Industrial | Minimum | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	1.3	1.2
Weighted Average Cost of Capital Risk Premium Multiple | Loans Payable | Industrial | Maximum | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	1.4	1.5
Weighted Average Cost of Capital Risk Premium Multiple | Loans Payable | Industrial | Weighted Average | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	1.4	1.4
Weighted Average Cost of Capital Risk Premium Multiple | Loans Payable | Apartment | Minimum | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	1.3	1.2
Weighted Average Cost of Capital Risk Premium Multiple | Loans Payable | Apartment | Maximum | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	1.5	1.6
Weighted Average Cost of Capital Risk Premium Multiple | Loans Payable | Apartment | Weighted Average | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	1.3	1.4
Weighted Average Cost of Capital Risk Premium Multiple | Loans Payable | Retail | Minimum | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	1.3	1.3
Weighted Average Cost of Capital Risk Premium Multiple | Loans Payable | Retail | Maximum | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	1.8	1.6
Weighted Average Cost of Capital Risk Premium Multiple | Loans Payable | Retail | Weighted Average | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	1.4	1.3